* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

header {
    background-color: #fff;
    padding: 3rem 2rem 2rem;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1.2rem;
    color: #666;
    font-weight: 300;
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

.categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.category-card {
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.15);
}

.category-preview {
    position: relative;
    height: 300px;
    overflow: hidden;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 4px;
    background: #e0e0e0;
}

.category-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.category-preview img:first-child {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

.category-info {
    padding: 1.5rem;
}

.category-name {
    font-size: 1.8rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    text-transform: capitalize;
}

.category-count {
    color: #666;
    font-size: 1rem;
}

.placeholder-message {
    text-align: center;
    padding: 3rem;
    color: #999;
    font-style: italic;
}

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .categories {
        grid-template-columns: 1fr;
    }
    
    .category-preview {
        height: 250px;
    }
}